The RGB color space is an additive color space which models the way light of a few specific frequencies are combined when travelling in the same direction. RGB is known as an additive color space because when light of two different frequencies travel together, from the point of view of an observer, these colors are added to create a new color experience. In particular, the colors which the RGB color space concerns itself with are the red, green and blue frequencies (hence the abbreviation RGB). These three frequencies are chosen because each one corresponds roughly with one of the three types of color-sensitive cones in the human eye. With the appropriate combination of red, green and blue light, one can reproduce many of the colors that can be experienced by a human. For example pure red and green light produce yellow, red and blue make magenta, blue and green equal cyan and red, blue and green generate white.

One common application of the RGB color space to display computer graphics on a monitor. For each pixel in the image, independent values for red, green and blue are stored. There is a fixed range of red, green and blue intensities displayable by the computer monitor, but by choosing the appropriate combination of red, green and blue light, one can stimulate in the human eye the perception of many of the colors between the black level and white point of the monitor being used to display the image. Typically the values stored vary between zero and 255.

It is important to note that the intensity of the color output on computer display devices isn't always linear. That is, even though a value of 127 is very close to halfway between zero and 255, the color output of a computer display device when displaying (127, 127, 127) is significantly lower than halfway between the black level[?] and white point[?] of your monitor. This is because most display devices have a gamma characteristic different from 1 (i.e. the behavior of most display devices is, unfortunately, not linear in the relationship between color value and output intensity), and require gamma correction.

In HTML the hexadecimal color coding is used. The table below shows some of the possible colors with their color codes:

000000

000033

000066

000099

0000CC

0000FF

330000

330033

330066

330099

3300CC

3300FF

660000

660033

660066

660099

6600CC

6600FF

990000

990033

990066

990099

9900CC

9900FF

CC0000

CC0033

CC0066

CC0099

CC00CC

CC00FF

FF0000

FF0033

FF0066

FF0099

FF00CC

FF00FF

003300

003333

003366

003399

0033CC

0033FF

333300

333333

333366

333399

3333CC

3333FF

663300

663333

663366

663399

6633CC

6633FF

993300

993333

993366

993399

9933CC

9933FF

CC3300

CC3333

CC3366

CC3399

CC33CC

CC33FF

FF3300

FF3333

FF3366

FF3399

FF33CC

FF33FF

006600

006633

006666

006699

0066CC

0066FF

336600

336633

336666

336699

3366CC

3366FF

666600

666633

666666

666699

6666CC

6666FF

996600

996633

996666

996699

9966CC

9966FF

CC6600

CC6633

CC6666

CC6699

CC66CC

CC66FF

FF6600

FF6633

FF6666

FF6699

FF66CC

FF66FF

009900

009933

009966

009999

0099CC

0099FF

339900

339933

339966

339999

3399CC

3399FF

669900

669933

669966

669999

6699CC

6699FF

999900

999933

999966

999999

9999CC

9999FF

CC9900

CC9933

CC9966

CC9999

CC99CC

CC99FF

FF9900

FF9933

FF9966

FF9999

FF99CC

FF99FF

00CC00

00CC33

00CC66

00CC99

00CCCC

00CCFF

33CC00

33CC33

33CC66

33CC99

33CCCC

33CCFF

66CC00

66CC33

66CC66

66CC99

66CCCC

66CCFF

99CC00

99CC33

99CC66

99CC99

99CCCC

99CCFF

CCCC00

CCCC33

CCCC66

CCCC99

CCCCCC

CCCCFF

FFCC00

FFCC33

FFCC66

FFCC99

FFCCCC

FFCCFF

00FF00

00FF33

00FF66

00FF99

00FFCC

00FFFF

33FF00

33FF33

33FF66

33FF99

33FFCC

33FFFF

66FF00

66FF33

66FF66

66FF99

66FFCC

66FFFF

99FF00

99FF33

99FF66

99FF99

99FFCC

99FFFF

CCFF00

CCFF33

CCFF66

CCFF99

CCFFCC

CCFFFF

FFFF00

FFFF33

FFFF66

FFFF99

FFFFCC

FFFFFF

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